Pocket thermometer



J. l SCHWARTZ POCKET THERMOMETER Filed; July 21, 1928 MiHE fizzHiE:

, I INVENTOR .j/m [5049762 567/17/7/2 ATTORNEY.

Patented June 17, 1930 UNITED STATES PATENT OFFICE-3 Lf JOHN LEONARDSCHWARTZ, OF PHILADELPHIA, PENNSYLVANIA, ASSIGN'OR TO 7IHILADEIlZ'IlEI-]II .A THERMOMETER 00., OF PHILADELPHIA,II?lElNN'SYLVANIA, A CO- F. as

PARTNERSHIP COMPOSED OF JOHN LE AND CLARENCE A. ROSSMAN ONABD SCHWARTZ,GEORGE W. ROSSMAN,

(POCKET THERMOMETER Application filed July. 21,

This invention relates :to pocket thermometers. i I

, Among the objects of the invention are: to improve the construction ofpocket thermometers;,to provide a, thermometer with a casing to guardthe-glass against breakage;

toprovide a thermometer with a casing, a portion ofwhich is arrangedforengagement by the fingers of an operator to'provide a handle for thethermometer; to provide a thermometer with a handle by which thethermometer may be manipulated without slipping from the grasp of theoperator; toprovide a pocket thermometer of such construction that thethermometer element may be easily and quickly replaced in a handle inthe event of breakage; to provide a pocket thermometer of suchconstruction that a removable thermometer element is held in a bracedand strengthened position relative the remainder of the unit; and manyother objects and advantages as will be more apparent as the descriptionproceeds.

Although of course susceptible to ordinary thermometer uses, theinvention is of particularly advantageous use in determining thetemperatures of articles which provide appreciable resistance to theinsertion, of a thermometer, or to its withdrawal afterinsertion. Suchuses, for instance as testing meats or vegetables, when appreciablestrain is applied to the thermometer in order to insert it far enoughinto the article as to note the internal temperature thereof. It is thusof peculiar importance tothosewho make inspections of freight or expressshipments. In such services the normal life of a thermometer is notusually of great length, and it is desirable to provide a support orcasing in which a refill or thermometer element may be quickly andeasily-inserted by the operator. i r

In the accompanying drawings: I

Fig. 1, represents a longitudinal section through a pocket thermometeraccording to this invention, with the thermometer and its handle shownin elevation, I

Fig. 2, represents a section through the improved handle and the upperpart oft-he guard or casing, with the therrnemeter els 1928. 7 SerialNo. 294,381.

ment and the'retaining cap shown in eleva I tion,

' Fig. '3, represents a transverse section taken on line 33 of Fig. 1, Y

Fig. e, represents an elevation of the retaining plug on an enlargedscale, m

Fig. 5, represents a'section through the terrule or handle of thedevice, on an enlarged scale, and A Fig. 6, represents a fragment of thethermometer element i V The pocket thermometer comprises a thermometerA,handle andcasing or housing Cl .The thermometer is preferably more orless sharply. pointed at one end, as at 10, and

My l at n at its upper end is providedwith an enlarged or flanged beadorhead 11 formed on the end of shank12. It will be understood that thebulb'o f the thermometer is in the pointed" l end 10. V

Theh andle B comprises an open ended tubular member, havinga lowerconstricted bore13, merging into a larger borell, at the shoulder 15.The material forming the bore 13 is externally threaded as at 16,Whereas thela'rger upper bore 14 is internallythread- Ier diarneter ofthe main barrel of thehandle :inj Fig1f5, and the arrangement is suchthat the bore "13 has a mere sliding engagement V V 9 pointfirstthroughthe handle part as shown with the shankjl2 of the.element,f"soj that I when the head or headof the element impingesagainst the shoulder 15 of the handle,

the shank immediately adjacent the head is held vagainstrocking movementby the, bore '13. :lnjorder' toholdthefenlar'ged bead jar *1theelementagainst the. shoulder 15,

the plug 20 is screwed into the upper end of the bore 14, engagingthreads 17, and bearing against the end of the thermometer ele-v ment."Vith this rigid assembly thus provided the thermometer element isreinforced by the sides of the bore 13, while being firmly held againstaxial movement between the end of plug 20 and shoulder 15.. It is to benoted that this lateral reinforcement effected by the bore 13 is to apoint well below the external knurled shoulder 18.

To the thermometer unit thus effected, the casing G, having the upperinternal threads 7 22, and lower drain opening 23,may be eter in thepocket of the user or operator.

7 to properly fitted shop for repairs. With the invention herein, it isbut necessary to i secure a new thermometer unit, which is readilyinserted upon removing the plug 20, as will be obvious. 7

It is of importance to note the positive and firm grip or grasp that iseffected by the 0 formation of handle discussed. Thehandle,

in assembled and usable form, comprises a relatively smooth barrel,having atv each end 7 raised knurling. .As thermometers of this classare frequently used on slippery meats and fruits, etc., from timeto timethe handle becomesso slippery asvto cause the fingers to slideoff thehandle, (in the normal case), with resultant breakage of thethermometer, either 7 from dropping the instrument, or

from applying thestrain laterally on the frangible glass. In theinstantinvention, however, the fingers simply engage the shoulderseither in forcing the thermometer in, or in pulling itout, and theknurling is sufficient to preventsuch sliding'as hasbeen noted. It isofimportance also to note the ornamental effect presented by theconstructlon disclosed. It'more closely resembles a pencil in its visualaspect than has heretofore been possible, while at the same timeaffording the more important resultsof instant disassembly, andreinforcement ofthe glass of the thermometer. 1

closed provides adequate guarding for the though in spaced relation tothe glass for its fulljlength', while enablingthe proper strong griponthe glasswhen the guard is removed for the normal use of the device.

f Iclaim as my invention V I A pocket thermometer comprising an open vended hollow body, the bodyhaving a lower 7 restricted internal bore anda larger threaded upper bore, and having a curved shoulder It is pointedout that the casing as disabut the head or flange of the thermometerover substantially its entire area to compress the flange between theplug and the shoulder, raised knurling formed on the body atsubstantially the level of the flange of the thermometer, raisedknurling formed on the plug, the knurlings and the body forming anon-slip handlefor the unit, and a casing threaded upon the threads ofthe lower end of the body the engagement of the plug against thethermometer end being such as to rigidly and immovably hold the thermometer inthebody. I V v In testimony whereof I aflix my signature.

instrument. in the pocket of the user,*al-

